/**
 *    Copyright 2009-2017 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.apache.ibatis.scripting.xmltags;

import java.util.List;

/**用于描述一组SqlNode对象，通常一个Mapper配置是由多个SqlNode对象组成的，这些SqlNode对象通过MixedSqlNode进行关联，组成一个完整的动态sql配置
 *
 * @author Clinton Begin
 */
public class MixedSqlNode implements SqlNode {

	// 组合模式，拥有一个SqlNode的List
	private final List<SqlNode> contents;

	public MixedSqlNode(List<SqlNode> contents) {
		this.contents = contents;
	}

	@Override
	public boolean apply(DynamicContext context) {
		// 依次调用list里每个元素的apply
		// 这里SqlNode.apply只是将${}这种参数替换掉，并没有替换#{}这种参数
		for (SqlNode sqlNode : contents) {
			sqlNode.apply(context);
		}
		return true;
	}
}
